I'm a founder with a young child. It's awesome. You can't do it alone obviously but with a partner and a support system it's totally doable. Even the sleepless night thing is mostly contained to the first couple months.

"What do you mean" is a nice easy response. I like it. It's not going to stop all assholes but it will filter out the ones are are ashamed of themselves, which is probably a lot. What it won't stop is the ones with pernicious superficial rationalizations for excluding women.. the "short people shouldn't be firefighters" crowd.